2. Does she drive a bus? --………. Is she driving a bus? --………….What is she doing? -- …………
3. Does he clean windows? --…….. Is he cleaning windows? --………What is he doing? -- …………..
4. Do they teach? --………… Are they teaching now? --……….What are they doing? --………

2. Does she drive a bus? -- Yes, she does.

Is she driving a bus? --No, she isn't.

What is she doing? -- She's playing the piano.

3. Does he clean windows? -Yes, he does.

Is he cleaning windows? --Yes, he is.

What is he doing? -- He's cleaning the window.

4. Do they teach? --Yes, they do.

Are they teaching now? --No, they aren't.

What are they doing? --They are watching TV.